This lead free CrimpRing (TM) tee is used to make a three way connection between potable or radiant heating PEX tubing. This 1/2 crimp by 1/2 crimp by 3/8 crimp branch tee is made of lead free brass and must be joined to the PEX tubing using a copper crimp ring to form a fast, reliable, and permanent seal. It is recommended to use an electric crimp tool to make the crimp connection.